This International Standard specifies the electrical and mechanical characteristics of concentric lay, overhead conductors of wires formed or shaped before, during or after stranding, made of combinations of any of the following metal wires: a) hard aluminium as per IEC 60889 designated A1; b) hard aluminium as per IEC 60889 designated A1F wire shaped before stranding; c) hard aluminium alloy as per IEC 60104 designated A2 or A3; d) hard aluminium alloy as per IEC 60104 designated A2F or A3F shaped before stranding; e) regular strength steel, designated S1A or S1B, where A and B are zinc coating classes, corresponding respectively to classes 1 and 2; f) high strength steel, designated S2A or S2B; g) extra high strength steel, designated S3A; h) aluminium clad steel, designated SA. The following are examples of some possible conductor designations. Other combinations are also permitted. • A1F, A2F, A3F • A1F/S1A, A1F/S1B, A1F/S2A, A1F/S2B, A1F/S3A • A1F/A1, A1F/A2, A1F/A3 • A1F/SA, A2F/SA, A3F/SA Other possible conductor types not included above are not specifically excluded.